block: misc updates
This patch makes the following misc updates in preparation for
disk->part dereference fix and extended block devt support.
* implment part_to_disk()
* fix comment about gendisk->part indexing
* rename get_part() to disk_map_sector()
* don't use n which is always zero while printing disk information in
diskstats_show()
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/blk-core.c b/block/blk-core.c
index 86d22e7..a0dc2e7 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -60,7 +60,7 @@
if (!blk_fs_request(rq) || !rq->rq_disk)
return;
- part = get_part(rq->rq_disk, rq->sector);
+ part = disk_map_sector(rq->rq_disk, rq->sector);
if (!new_io)
__all_stat_inc(rq->rq_disk, part, merges[rw], rq->sector);
else {
@@ -1557,7 +1557,8 @@
}
if (blk_fs_request(req) && req->rq_disk) {
- struct hd_struct *part = get_part(req->rq_disk, req->sector);
+ struct hd_struct *part =
+ disk_map_sector(req->rq_disk, req->sector);
const int rw = rq_data_dir(req);
all_stat_add(req->rq_disk, part, sectors[rw],
@@ -1745,7 +1746,7 @@
if (disk && blk_fs_request(req) && req != &req->q->bar_rq) {
unsigned long duration = jiffies - req->start_time;
const int rw = rq_data_dir(req);
- struct hd_struct *part = get_part(disk, req->sector);
+ struct hd_struct *part = disk_map_sector(disk, req->sector);
__all_stat_inc(disk, part, ios[rw], req->sector);
__all_stat_add(disk, part, ticks[rw], duration, req->sector);